PLATE 5 



Fig. i. Achomosphaera ramulifera var. perforata nov. London Clay ; Enborne 

 (boring depth, 83-25 feet). Note precingular archaeopyle. WC. 3/6(1). X425. 



Fig. 2. Hystrichosphaera monilis sp. nov. Holotype, ¥.51763(1), X500. 



Fig. 3. Achomosphaera alcicornu (Eisenack). ¥.51765(1). X425. 



Fig. 4. Achomosphaera ramulifera var. perforata nov. Holotype, ¥.51764(1). X475. 



Fig. 5. Cordosphaeridium fibrospinosum sp. nov. Holotype, ¥.51747(1). X475. 



Fig. 6. Hystrichosphaera ratnosa var. gracilis nov. Holotype, ¥.51757(1). X350. 



Fig. 7. Hystrichosphaera perforata sp. nov. Holotype, ¥.51760(1). X550. 



Fig. 8. Cordosphaeridium latispinosum sp. nov. Holotype, ¥.51746(2). X640. 



